Optimization the quantity, locations and output currents of anodes to improve cathodic protection effect of semi-submersible crane vessel

In order to improve corrosion protection effect of semi-submersible crane vessel (SSCV), 3-D boundary element method combined with automatic movement of anodes and adjustment of currents is developed to optimize anode quantity, location and output current of impressed current cathodic protection system for SSCV. Numerical simulation results show that protection potential of SSCV is obviously smoothed after optimization. The protection effect of SSCV in four different states is also predicted and simulation results indicate that SSCV is well protected in the whole service life when the protective coating on hull is repainted every seven years. Finally, challenges associated with cathodic protection providing for marine engineering equipment are discussed. •Impressed current cathodic protection system is widely adopted to protect marine infrastructures from corrosion.•The numbers of anodes of impressed current cathodic protection system are designed and optimized.•The best location and output current of anodes are automatically optimized by optimization methods combined with the boundary elements technology.•The life-time of impressed current cathodic protection system is predicted.